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Power Transformer Protection - ABB· PDF filetransformers 4.2.3 Differential relays for auto-transformers 4.3 Overcurrent protection and impedance relays 4.3.1 Time-overcurrent relays 4.3.2 Under-impedance relays 4.3.3 Distance relays 4.4 Grou~d fault protection 4.4.1 General 4.4.2 Low irrnpedance residual overcurrent relay …

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